Based on the assumption that the sample and preamplifier
are the dominant noise sources for MRI, the coil loop is
matched to 50 Ohm through a coil matching network and
the preamplifier is noise matched to 50 Ohm too, through
another matching network. However, with receiving coils
in an array becoming increasingly smaller, the noise
contributed from their matching networks cannot be
neglected. Here we present two methods to simplify the
coil and preamplifier matching networks, therefore their
noise contribution is reduced

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